You were trying to get out a new subject, something that most people have not really thought of so it took more explanation then you really had time for so you were rushed. If you said all of that in that short of a time and did not say um at all you would have sounded like a rushed robot. It's impressive though that your blog looks at things other then the popular topics. He wanted to hammer the Papi talk cuz thats hot right now. Hopefully somebody out there saw this firstly and then found your segment interesting enough to come over here and get abused by me.

"If you said all of that in that short of a time and did not say um at all you would have sounded like a rushed robot"

This is a good point. When you (anyone) doesn't want to read from a script, wants to be casual, "ums" are going to come out. If you can cut down on them, fine. But I wouldn't let it worry you, you did really well.